tured silicate of soda, with literature on the principal uses of each grade as applied. In charge of exhibit: C. F. Wolcott, G. W. Wait and E. A. Russell.

THE PHILADELPHIA TEXTILE MACHINERY Co.-A model of a Proctor four-truck drier for paints, chemicals, colors, etc. A model of Proctor three-conveyor drier for cotton, wool, chemicals, etc. A large display of all kinds of materials dried in Proctor Research Laboratory. In charge of exhibit: E. B. Ayres, Mrs. J. C. Reiter, W. R. Murray, Joseph Tiers and W. J. Dudley.

PNEUMERCATOR CO., INC.-A working outfit illustrating the simplicity of operation of the pneumercator tank gage. Various models will be shown. In charge of exhibit: William Thomas, A. F. Kuehne and Henry Jones.

PRATT ENGINEERING & MACHINE Co.-Photographs of machinery and apparatus manufactured for the chemical and fertilizer trade, and photographs of various plants designed and erected by this company for the manufacture of sulphuric and nitric acids and fertilizers. Designs of plants for the manufacture of acid phosphate and commercial fertilizers and sulphuric acid. In charge of exhibit: George F. Hurt, G. A. Austen, E. E. Maher and C. A. Murphey.

PRECISION INSTRUMENT Co.-Carbon dioxide, sulphur dioxide, recorders, indicating draft gages (single, 2 in 1, to 5 in 1), recording gages, calorgraph, gravitometer, coal calorimeter, and other apparatus for testing and measuring gases. The precision CO2 recorder delivers every 3 min. a definite fixed volume of flue gas, analyzes the mixture and then records on a chart the percentage of carbon dioxide present. It is accurate to within 0.5 per cent. In charge of exhibit: Charles E. Conway.

PRECISION THERMOMETER & INSTRUMENT CO.
PRESSED STEEL TANK Co.
PRODUCT SALES Co.

PROVOST ENGINEERING CORP.

PYROLECTRIC INSTRUMENT Co.-Electrical precision instruments, a-c and d-c galvanometers, electrometers, etc. A new type of lamp and scale reflection indicator, the Northrup pyrovolter, a small Northrup-Ajax high-frequency induction furnace with water-cooled induction coil, in operation. In charge of exhibit: H. F. Porter and W. C. Harter. QUIGLEY FURNACE SPECIALTIES Co.-Temperature tests on the bonding strength of Hytempite, a highly refractory plastic material for bonding fire brick, etc. Carbosand, a highly refractory fire sand for making rammed-in linings. Insulbrix, a specially prepared cellular insulating brick for furnaces; Quigley powdered coal system for preparing, transporting and burning powdered coal. In charge of exhibit: W. S. Quigley, H. A. Kimber, W. O. Renkin, J. G. Coutant and L. G. McPhee.

RARITAN COPPER WORKS and the ANACONDA COPPER MINING CO.-By-products obtained during the electrolytic refining of copper: White arsenic, tellurium oxide, tellurium, selenium, gold, silver, platinum and palladium, nickel and copper sulphates. Lead from the International Lead Refining Co., East Chicago, Ind., high-grade electrolytic zinc from the Great Falls Refinery, "Anaconda white lead" from the Anaconda Lead Products Co., East Chicago, Ind., products of the new copper rolling mill. In charge of exhibit: S. Skowronski and H. D. Hawks.

RAYMOND BROS. IMPACT PULVERIZER Co.-Four models in operation illustrating the various types of pulverizing mills manufactured by this company, three to be one-quarter size of the actual machines and one full-size model small No. 0000 pulverizer used extensively in the chemical, dry color and dyestuff industries. In charge of exhibit: C. M. Lauritzen, W. M. Cook, S. B. Kanowitz, R. A. Lachmann and W. B. Senseman.

REDMANOL CHEMICAL PRODUCTS Co.-Cigar and cigarette holders manufactured from transparent redmanol. Demonstration of manufacture of molded parts from redmanol molding mixtures. In charge of exhibit: L. V. Redman.

REPUBLIC FLOW METERS Co.-The regular Republic flow meter, together with a recently developed flow meter for making very low differential pressures. This meter measures accurately as low as one-thousandth of an inch water differential pressure. A blower will be installed in the booth so that both meters will be operating under regular conditions. In charge of exhibit: James D. Cunningham, J. M. Spitzglass, C. R. Matheny, C. E. McGregor, J. Tigerman and T. S. Williams.

RESEARCH CORPORATION.

RESEARCH LABORATORY OF CHICAGO.

REVOLVATOR Co-Models of revolving portable elevators. In charge of exhibit: H. S. Germond, Jr., and others. ROESSLER & HASSLACHER CHEM. Co.

ROLLIN CHEMICAL CO.

ROSSENDALE-REDDAWAY BELTING & HOSE Co. SARCO CO., INC.-A complete line of thermostatic steam and radiator traps, metallic gaskets and several models of standard and special temperature regulators. In charge of exhibit: Clement Wells, E. J. Ritchie, F. D. Harger, G. M. Cameron, G. F. Cordner and G. B. Burke.

E. H. SARGENT Co.-Laboratory supplies.

SCHAAR & Co.-Chemical laboratory apparatus of American manufacture, including analytical balances, electric flask heaters, etc., manufactured by this company. Americanmade glassware, porcelain ware and apparatus handled for other manufacturers. In charge of exhibit: Adolph E. Schaar, Eric W. Ohman, Andrew R. Stevenson and J. Gardner Goodwin.

SCHAEFFER & BUDENBERG-Pressure and vacuum gages, mercurial pressure and vacuum gages, gage testers, "Crescent" industrial thermometers, "Reform" mercury thermometers, "Columbia" mercury recording thermometers and other testing apparatus. In charge of exhibit: C. E. George, and Messrs. Parker, Coesfeld and Campbell. JOSEPH SCHNEIBLE

SCHUTTE & KOERTING Co.-Equipment for handling chemiccal gases: automatic blowcase attachment, jet pumps, etc., used in handling of chemical liquids. Power-plant valves, spray nozzles, oil-burning equipment. In charge of exhibit: Dr. C. H. Kimberly, A. C. Nell and J. S. Patten.

SCHWARTZ SECTION SYSTEM-A sectional cabinet for filing laboratory chemicals and reagents, samples and specimens. In charge of exhibit: M. P. Schwartz.

SCIENTIFIC EQUIPMENT Co.-(See Central Scientific Co. and Kawaunee Mfg. Co.)

SCIENTIFIC MATERIALS Co.-Standard lines of laboratory glassware and porcelain. Complete line of filter papers. Special graduated and blown glassware. The new Fisher burner; museum jars; Scimatco tubing, etc. In charge of exhibit: R. H. Hix and Dr. F. L. Hinckley.

ERNEST SCOTT & Co.-Photographs showing installations made in the following industries: Oil extraction from nuts, seeds, beans, etc., by Scott's solvent process; extraction of grease from bones, packers' tankage, etc.; recovery of glycerine in soap factories and caustic soda from paper pulp spent liquors, cotton mercerizing mills, etc., by the Scott evaporator. Extraction of oil from fish and fish waste, glycol and glycerine refining plants, fatty acid distillation. In charge of exhibit: H. Austin, Robert MacGregor and C. E. Bradley.

SOWERS MANUFACTURING Co.-The construction of Dopp seamless steam jacketed kettles demonstrated by a sawedup section of a 16-gal. kettle, showing that kettle wall, jacket and staybolts are one single casting with no joints, bolts, seams or welds. A 10-gal. Dopp standard vacuum pan with sweep mixer, 150-gal. Dopp standard kettle with ribbon-type mixer and 350-gal. Dopp rectangular kettle, 8 ft. x 3 ft. 6 in. x 2 ft. deep. In charge of exhibit: R. C. Boggess and P. B. Coxe.

D. R. SPERRY & Co-Filter presses, plates and frames made of various materials, filter press cocks and various plate surfaces. In charge of exhibit: D. R. Sperry and B. H. Conley.

THE STAR BRASS WORKS-General line of spray nozzles in operation. In charge of exhibit: H. D. Binks, B. R. Sausen and C. R. Kranz.

STEIN HALL & Co.

STIMPSON EQUIPMENT Co.

C. H. STOELTING.

F. J. STOKES MACHINE Co.-Rotary tablet machine in operation making naphthalene balls. Powder-filling machine in operation. Rotary vacuum drier, laboratory vacuum drier, vertical surface condenser, copper vacuum still, automatic water still. In charge of exhibit: L. H. Bailey and C. F. Coleman.

STRESEN-REUTER & HANCOCK, INC. STURTEVANT MILL Co.-The "Open-Door" line of crushing, grinding, pulverizing, screening, mixing, elevating and conveying machinery. The "Open Door" will be especially featured as a labor and time saver. They swing like the door of a safe and open the interior of their various machines to more complete accessibility than can any number of parts or castings and plates, the removal of which costs so much in time wasted. In charge of exhibit: H. A. Tomlinson, L. N. Doyle, J. S. Vrabek and W. T. Doyle.

SULLIVAN MACHINERY Co.-A model air-lift pumping plant in operation, consisting of Sullivan air-lift pump, separating head, cyclone boosters, etc., electrically operated by compressed air; also samples of its acid pumps, separating heads in standard and special acid and chemical resistant material, and display photographs of installations and equipment. In charge of exhibit: John Oliphant, Howard T. Walsh, Joseph H. Brown, R. E. C. Martin and S. B. King.

SUNBEAM CHEMICAL CO.-Methylene blue, paranitrosodimethylaniline, and acid azo red, eosine, erythrosine, crude glycerine, sulphonated oils, and the dye soap "Rit." charge of exhibit: L. C. Cates.

In

SWEDISH CRUCIBLE STEEL Co.-Steel castings for heattreating processes and for resisting oxidation under high temperature. Complimentary tickets to the Exhibition of the American Steel Treaters' Society will be issued at this booth. In charge of exhibit: H. H. Harris, Mr. Van Arman and Mr. Kingsley.

SWENSON EVAPORATOR Co.-One evaporator will be in operation, and another so arranged that an examination of the internal construction can be readily made. In charge of exhibit: F. M. de Beers, P. B. Sadtler, P. H. Appell, D. C. Giles, S. W. Hind, A. H. Boehmer and F. F. Mackentepe.

C. J. TAGLIABUE MFG. CO.-"Tag" P. & W. liquid level and condensate controllers for automatically maintaining liquid levels in evaporators, closed and open tanks, etc. "Tag" self-operating and perfect automatic temperature and pressure controllers for automatically maintaining a uniform temperature or pressure regardless of a variable initial supply in coolers, driers, mixing kettles, stills, etc. "Tag" automatic combination time and temperature controller, the "Tag" absolute pressure controller. In charge of exhibit: Wallace W. White, D. M. Morgan and V. Wichum. TANK EQUIPMENT CO.

TAYLOR INSTRUMENT Co.-Indicating and recording thermometers and pyrometers; laboratory and oil-testing instruments; pressure and temperature regulators. In charge of exhibit: Messrs. Ely, Amdursky, Schwartz, Taylor, Heyss, Pagenstecker, Lemke, Rinder, Levy, Sutherland, Drs. Clark and Hurlbert.

TECHNICAL PRODUCTS Co.

TEXAS GULF SULPHUR Co.-In charge of exhibit: J. A. B. Landell and Arthur S. Cosler.

THE THERMAL SYNDICATE, LTD.-Vitreosil products for laboratory and plant. Vitreosil is unaffected by the usual mineral acids or by sudden and extreme changes of temperature, as will be demonstrated by heating vitreosil crucibles to a temperature of approximately 1000 deg. C. and plunging them immediately into cold water. In charge of exhibit: Stephen L. Tyler and William W. Winship.

THE THERMO ELECTRIC INSTRUMENT Co. - Freas and Thelco types of constant temperature apparatus, forced air and vacuum ovens, also the latest type, the Swirl oven, in which the operator can keep his material in constant agitation while it is subjected to a constant_temperature. In charge of exhibit: E. H. Heacock, J. S. LaMer and Royal B. Freas.

ARTHUR H. THOMAS CO.-Kelley electrometric titration apparatus for the determination of Cr, V, and Mn in steel and ferrous alloys. Cain electrometric titration apparatus for the determination of carbon in steel by the direct combustion method. Edwards gas density balance. Volumetric apparatus; electric drying ovens; Mandler diatomaceous filters, etc. In charge of exhibit: R. M. Miller, H. C. Roak and C. C. Roberts.

THWING INSTRUMENT Co.-Recording and indicating pyrometers for all ranges of temperature, paper testing apparatus, particularly basis weight scales, and an instrument for recording the tearing strength of paper. In charge of exhibit: Dr. Charles B. Thwing and William S. Miller. TITANIUM ALLOY MFG. CO.

TOLHURST MACHINE WORKS-A 32-in. heavy type suspended centrifugal with bottom discharge. Motor-driven 40-in. self-balancing centrifugal. A 20-in. solid curve centrifugal and a new type 12-in. laboratory centrifugal. In charge of exhibit: John S. Gage, T. A. Bryson and T. M. Stuart.

TOWER & WOODEN TANK INDUSTRIAL COUNCIL.-The Council comprises the following companies: Challenge Co., Dunck Tank Works, Eagle Tank Co., Hauser-Stander Tank Co., Johnson & Carlson, U. S. Wind Engine & Pump Co., Wendnagel & Co. Rectangular tank, agitator, generator, film developing, crystallizing, filter tanks, tank with sloping bottom for drainage, model of sprinkler or gravity water supply tank, and burned-in lead-lined chemical tanks, each having a portion cut away so that details of construction may be studied. In charge of exhibit: Engineers of above mentioned companies.

UNION STEAM PUMP CO.

UNION SULPHUR Co.-In charge of exhibit: W. N. Wilkinson and W. M. P. Taylor.

UNION THERMOMETER CO.

UNITED FILTERS - 4-1 type American filter with direct motor drive. A No. 2 size Sweetland filter constructed of aluminum, and a small model of a Kelly unit. A small United plate and frame press exhibited for the first time. Samples of cotton and metallic filter cloth for inspection of visitors. In charge of exhibit: C. B. Oliver, J. T. Hoyt and Winslow Souther.

UNITED LEAD Co., the UNITED LINED TUBE & VALVE CO. and the RAYMOND LEAD WORKS-United lead-lined iron pipe, valves, fittings and tin-lined valves and fittings. A new line of silver-lined valves, centrifugal acid pumps, Ulco hard metal. In charge of exhibit: L. B. Gallison and C. B. Holden.

U. S. BUREAU OF MINES-Exhibits from the various field offices of the Bureau and safety devices including the army gas mask. In charge of exhibit: M. F. Leopold.

U. S. CAST IRON PIPE & FOUNDRY CO.-Photographs and samples of Usicast products. In charge of exhibit: H. A. Hoffer and J. D. Capron.

U. S. INDUSTRIAL ALCOHOL Co. and U. S. INDUSTRIAL CHEMICAL Co.-Many uses of alcohol shown on an exhibit board. In charge of exhibit: B. R. Tunison.

U. S. STONEWARE Co.-Representative pieces of standard chemical stoneware. In charge of exhibit: F. S. Wills and G. M. Wills.

U. S. WIND ENGINE & PUMP Co.-(See Tower and Wooden Tank Industrial Council).

UNIVERSAL OIL CO.

UNIVERSE Co.

VAN SCHAACK BROS. CHEM. WORKS.

VALLEY IRON WORKS, Appleton, Wis.-A small Vesuvius sulphur burner, a laboratory beating engine and a centrifugal acid-resisting pump. In charge of exhibit: W. H. Burns and R. A. Peterson.

VALLEY IRON WORKS, Williamsport, Pa.-A line of laboratory autoclaves ranging from 23-qt. to 5-gal. capacity and built for operating pressures up to 1000 lb. per sq.in. In charge of exhibit: R. L. Riley and Thomas Senior. VIRGINIA SMELTING Co.

THE VITREOUS ENAMELING Co.-A full line of Vitreous enameled pans and trays. In charge of exhibit: Harry Warman and Charles E. Bullard. WALLACE & TIERNAN Co.

WEDGE MECHANICAL FURNACE WORKS.

WENDNAGEL & Co.-(See Tower and Wooden Tank Industrial Council).

WERNER & PFLEIDERER CO. Laboratory mixers and grinders. In charge of exhibit: Emil Staehle, J. C. Caley, C. Pletscher, S. D. Gridley, H. Gronbak and H. E. Gregor. WESTERN RESERVE CHEMICAL CO.

WESTINGHOUSE ELECTRIC & MANUFACTURING CO.-Industrial motors and control devices, fans, meters, heating appliances, circuit-breakers and switches.

WHITALL TATUM Co.-Chemical glassware and laboratory apparatus. In charge of exhibit: J. F. Matthes. J. G. WHITE ENGINEERING CORP.

THE WHITLOCK COIL PIPE Co.-Working model showing the application of exhaust steam in heaters adapted to the chemical industries. In charge of exhibit: R. S. Bull, J. E. Chubb and E. B. Cole.

THE WIDNEY Co.-The Widney modulimeter for testing materials from steel to felt, rubber, paper, leather, etc. In charge of exhibit: S. W. Widney.

WILSON-MAEULEN Co.-Indicating and autographic pyrometers, especially the multiple record tapalog and dust and fume proof pyrometer switches. In charge of exhibit: C. J. Brown, G. V. Nightingale and F. C. Baker. ZAPON LEATHER CLOTH CO.

ZAREMBA CO.-Photograph and drawings of evaporator installations in many kinds of service in the chemical industries. In charge of exhibit: Edward Zeremba, W. H. Eggert, H. E. Jacoby and B. S. Hughes.

ZAVON, INC.

Natural and Industrial Resources of the

North Central States

The natural resources of that group of North Central States comprising Illinois, Indiana, Michigan and Wisconsin are marked by both variety and abundance, as will be set forth in considerable detail throughout this issue of CHEMICAL & METALLURGICAL ENGINEERING. Certainly during the war the nation had reason to be thankful for the raw material and finished products which came out of this region.

By means of introduction to the details, which follow, we show opposite an industrial map of the region and give a few tables of condensed information.

The map shows the principal mineral products of the States and gives their relative rank among all similar deposits in the United States.

Table I, showing the mineral production of the Chicago District, was prepared by a local committee of the Chicago Section, A. I. M. E., for use in the souvenir guide book issued for the Chicago meeting of the Institute, Sept. 22-29. Tables II, III, and IV contain data compiled from the U. S. Census of Manufactures and give interesting comparisons on the manufacturing industries of the four States.

The census for 1919, now in preparation, will undoubtedly show a striking increase in all items in the four States.

Non-Ferrous Metallurgy in the Chicago District

BY H. B. PULSIFER

OT infrequently we have asserted and defended

Nthe statement that Chicago is the very greatest

metallurgical center on the globe. Pittsburgh with its pre-eminence in iron and steel has to be considered, but with Pittsburgh the argument largely ends with the great iron and steel plants; Chicago comes second in iron and steel, but its real claim to greatness is in the abundance and variety of the non-ferrous metallurgical plants.

In the Chicago district one finds 35 great plants of prime importance, as well as over 200 foundries. In 1917 the author, with his students at Armour Institute of Technology, undertook a sort of census of these foundries in the Chicago district. It was desired to check up the current lists of plants, note the sort of work and equipment at each, the number of men employed as well as the presence of technical men, and the attitude toward using graduates. The results were amazing: plants employing a thousand or more men had never before come to our attention. The range of work surprised one: every stage from antipathy to full use of technical talent had several representatives.

In order to present a clear idea of the varied metals and processes one will discover in the Chicago district, the accompanying two lists have been prepared. List I arranges the more notable plants according to the metal handled or produced. List II groups the more conspicuous plants according to the sort of operations performed, such as smelting, refining or electroplating

It is frankly admitted that the lists are incomplete; in fact, the author has never started out on a metallurgical exploring trip about the great inland metropolis without abundant discoveries as to plants, metals and processes.

Surprisingly large and diversified amounts of ores and concentrates come to Chicago for treatment. Instances of this sort have been Butte zinc concentrates and Wisconsin zinc concentrates for roasting, Boss platinum ores from Nevada, lead concentrates from Wisconsin, antimony ores from South America, gold bullions from cyanide plants, lead bullions from Mexico, sweepings from the United States and Canadian mints.

CHICAGO PRE-EMINENT IN SECONDARY METAL
RECOVERY

It is in the secondary metal recovery, however, that Chicago probably ranks as pre-eminent. This business amounts to many millions of dollars a year. Scrap and junk metal is reclaimed in the usual furnaces and by similar processes as virgin metal, again going on the market indistinguishable from metals and alloys direct from ores. The abundance of almost every sort of scrap metal makes it profitable to make brass, bronze, solders, babbitts and various other alloys from reclaimed stock, possibly adding some fresh stock to bring to specification. One dare not say that gold bars from sweepings are less pure than bars from cyanide mills or that brass from scrap copper trolley wire is inferior to brass from new electrolytic ingots.

Certain of the Chicago plants are always doing interesting and notable work. The Western Electric Co., Crane & Co., the Great Western Co., Goldsmith & Co.,